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当函数返回NULL时，表示出现错误，errno被设置为ENOMEM（内存不足）或ERANGE（路径过长）。如果maxlen小于等于零，该函数会触发参数验证的无效参数处理器。

char *_getcwd(char *buffer, int maxlen); //ANSI版本
wchar_t *_wgetcwd(wchar_t *buffer, int maxlen ); //Unicode版本  

参数说明
buffer: Storage location for the path.
maxlen:Maximum length of the path in characters: char for _getcwd and wchar_t for _wgetcwd.

 
  Returns a pointer to buffer. 
 
A NULL return value indicates an error, and errno is set either to ENOMEM, 
indicating that there is insufficient memory to allocate maxlen bytes 
(when a NULL argument is given as buffer), or to ERANGE, indicating that the path is longer than maxlen characters. 
If maxlen is less than or equal to zero, this function invokes an invalid parameter handler, as described in Parameter Validation.